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sample为什么是3？

Posted by Mithril at 2006-10-21 14:42:01
In Reply To:Re:如果一个环A包含另一个环B，B还算不算？ Posted by:CO2 at 2006-10-21 14:41:12 
> 如果是完全包含的话
> b是不算的
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